source: source/ariba/utility/types/Identifier.cpp@ 2418

Last change on this file since 2418 was 2418, checked in by Christoph Mayer, 16 years ago

-umbenannt
File size: 17.2 KB
Line 
1// [Licence]
2// The Ariba-Underlay Copyright
3//
4// Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)
5//
6// Institute of Telematics
7// UniversitÀt Karlsruhe (TH)
8// Zirkel 2, 76128 Karlsruhe
9// Germany
10//
11// Redistribution and use in source and binary forms, with or without
12// modification, are permitted provided that the following conditions are
13// met:
14//
15// 1. Redistributions of source code must retain the above copyright
16// notice, this list of conditions and the following disclaimer.
17// 2. Redistributions in binary form must reproduce the above copyright
18// notice, this list of conditions and the following disclaimer in the
19// documentation and/or other materials provided with the distribution.
20//
21// THIS SOFTWARE IS PROVIDED BY THE INSTITUTE OF TELEMATICS ``AS IS'' AND
22// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ARIBA PROJECT OR
25// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
28// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32//
33// The views and conclusions contained in the software and documentation
34// are those of the authors and should not be interpreted as representing
35// official policies, either expressed or implied, of the Institute of
36// Telematics.
37// [Licence]
38
39#include "Identifier.h"
40#include "ariba/utility/misc/sha1.h"
41
42namespace ariba {
43namespace utility {
44
45uint Identifier::keyLength = MAX_KEYLENGTH;
46
47uint Identifier::aSize = Identifier::keyLength / (8 * sizeof(mp_limb_t))
48 + (Identifier::keyLength % (8 * sizeof(mp_limb_t)) != 0 ? 1 : 0);
49
50mp_limb_t Identifier::GMP_MSB_MASK = (Identifier::keyLength % GMP_LIMB_BITS)
51 != 0 ? (((mp_limb_t) 1 << (Identifier::keyLength % GMP_LIMB_BITS)) - 1)
52 : (mp_limb_t) -1;
53
54/* virtual serialization */
55vsznDefault(Identifier);
56use_logging_cpp( Identifier );
57
58//--------------------------------------------------------------------
59// constants
60//--------------------------------------------------------------------
61
62// predefined keys
63const Identifier Identifier::UNSPECIFIED_KEY;
64const Identifier Identifier::ZERO((uint32_t) 0);
65const Identifier Identifier::ONE((uint32_t) 1);
66
67// hex crap
68const char* HEX = "0123456789abcdef";
69gmp_randstate_t randstate;
70
71void Identifier::clearAddress() {
72 for (int i = 0; i < array_size; i++)
73 key[i] = 0;
74 isUnspec = false;
75 trim();
76}
77
78bool Identifier::setAddress(string address) {
79 // TODO
80}
81
82string Identifier::getAddress() const {
83 return toString();
84}
85
86//--------------------------------------------------------------------
87// construction and destruction
88//--------------------------------------------------------------------
89
90// default construction: create a unspecified node key
91Identifier::Identifier() {
92 seed();
93 isUnspec = true;
94 trim();
95}
96
97// create a key out of an normal integer
98Identifier::Identifier(uint32_t num) {
99 seed();
100 clearAddress();
101 key[0] = (uint32_t) num;
102 trim();
103}
104
105// create a key out of a buffer
106Identifier::Identifier(const unsigned char* buf, uint size) {
107 seed();
108 int trimSize, offset;
109 clearAddress();
110 trimSize = (int) std::min((uint) (aSize * sizeof(mp_limb_t)), size);
111 offset = aSize * sizeof(mp_limb_t) - trimSize;
112 memcpy(((char*) key) + offset, buf, trimSize);
113 trim();
114}
115
116// create a key out of an string with the given base
117Identifier::Identifier(const std::string& str, uint base) {
118 seed();
119
120 if ((base < 2) || (base > 16)) {
121 logging_error( "Identifier::Identifier(): Invalid base!" );
122 return;
123 }
124
125 string s(str);
126 clearAddress();
127
128 for (uint i = 0; i < s.size(); i++) {
129 if ((s[i] >= '0') && (s[i] <= '9')) {
130 s[i] -= '0';
131 } else if ((s[i] >= 'a') && (s[i] <= 'f')) {
132 s[i] -= ('a' - 10);
133 } else if ((s[i] >= 'A') & (s[i] <= 'F')) {
134 s[i] -= ('A' - 10);
135 } else {
136 logging_error( "Identifier::Identifier(): "
137 "Invalid character in string!" );
138 return;
139 }
140 }
141
142 mpn_set_str((mp_limb_t*) this->key, (const unsigned char*) s.c_str(),
143 str.size(), base);
144 trim();
145}
146
147// copy constructor
148Identifier::Identifier(const Identifier& rhs) {
149 seed();
150 (*this) = rhs;
151}
152
153// default destructur
154Identifier::~Identifier() {
155}
156
157void Identifier::seed(){
158 static bool isSeeded = false;
159 if( isSeeded ) return;
160
161 gmp_randinit_default( randstate );
162 gmp_randseed_ui( randstate, time(NULL) );
163
164 isSeeded = true;
165}
166
167//--------------------------------------------------------------------
168// string representations & node key attributes
169//--------------------------------------------------------------------
170
171void Identifier::setKeyLength(uint length) {
172 if ((length < 1) || (length > Identifier::keyLength)) {
173
174 logging_error( "Identifier::setKeyLength(): length must be <= " <<
175 MAX_KEYLENGTH << " and setKeyLength() must not be " <<
176 "called twice with different length!" );
177 return;
178 }
179
180 keyLength = length;
181
182 aSize = keyLength / (8 * sizeof(mp_limb_t)) + (keyLength % (8
183 * sizeof(mp_limb_t)) != 0 ? 1 : 0);
184
185 GMP_MSB_MASK = (keyLength % GMP_LIMB_BITS) != 0 ? (((mp_limb_t) 1
186 << (keyLength % GMP_LIMB_BITS)) - 1) : (mp_limb_t) -1;
187}
188
189// returns the length in bits
190uint Identifier::getLength() {
191 return Identifier::keyLength;
192}
193
194bool Identifier::isUnspecified() const {
195 return isUnspec;
196}
197
198std::string Identifier::toString(uint base) const {
199 if ((base < 2) || (base > 16)) {
200 logging_error( "Identifier::Identifier(): Invalid base!" );
201 return "";
202 }
203
204 if (isUnspec) return std::string("<unspec>");
205
206 char temp[80];
207 if (base == 16) {
208 int k = 0;
209 for (int i = (keyLength - 1) / 4; i >= 0; i--, k++) {
210 temp[k] = HEX[this->get(4 * i, 4)];
211 }
212 temp[k] = 0;
213 return std::string((const char*) temp);
214 } else if (base == 2) {
215 int k = 0;
216 for (int i = MAX_KEYLENGTH - 1; i >= 0; i -= 1, k++)
217 temp[k] = HEX[this->get(i, 1)];
218 temp[k] = 0;
219 return std::string((const char*) temp);
220 }
221 //#endif
222#if 0
223 size_t log2[33] = {0};
224 log2[2] = 1;
225 log2[4] = 2;
226 log2[8] = 3;
227 log2[16] = 4;
228 log2[32] = 5;
229 size_t sh = (sizeof(mp_limb_t)*8/log2[base]);
230 // key[array_size] = ~0;
231 mp_size_t last = mpn_get_str((unsigned char*) temp, base,
232 (mp_limb_t*) this->key, aSize+1);
233 for (int i = 0; i < last-sh; i++) {
234 temp[i] = HEX[temp[i+sh]];
235 }
236 temp[last-sh] = 0;
237 return std::string((const char*) temp);
238}
239#endif
240}
241
242//--------------------------------------------------------------------
243// operators
244//--------------------------------------------------------------------
245
246// assignment operator
247Identifier& Identifier::operator=(const Identifier& rhs) {
248 isUnspec = rhs.isUnspec;
249 memcpy(key, rhs.key, aSize * sizeof(mp_limb_t));
250 return *this;
251}
252
253// sub one prefix operator
254Identifier& Identifier::operator--() {
255 return (*this -= ONE);
256}
257
258// sub one postfix operator
259Identifier Identifier::operator--(int) {
260 Identifier clone = *this;
261 *this -= ONE;
262 return clone;
263}
264
265// add one prefix operator
266Identifier& Identifier::operator++() {
267 return (*this += ONE);
268}
269
270// sub one postfix operator
271Identifier Identifier::operator++(int) {
272 Identifier clone = *this;
273 *this += ONE;
274 return clone;
275}
276
277// add assign operator
278Identifier& Identifier::operator+=(const Identifier& rhs) {
279 mpn_add_n((mp_limb_t*) key, (mp_limb_t*) key, (mp_limb_t*) rhs.key, aSize);
280 trim();
281 isUnspec = false;
282 return *this;
283}
284
285// sub assign operator
286Identifier& Identifier::operator-=(const Identifier& rhs) {
287 mpn_sub_n((mp_limb_t*) key, (mp_limb_t*) key, (mp_limb_t*) rhs.key, aSize);
288 trim();
289 isUnspec = false;
290 return *this;
291}
292
293// add operator
294Identifier Identifier::operator+(const Identifier& rhs) const {
295 Identifier result = *this;
296 result += rhs;
297 return result;
298}
299
300// sub operator
301Identifier Identifier::operator-(const Identifier& rhs) const {
302 Identifier result = *this;
303 result -= rhs;
304 return result;
305}
306
307// compare operators
308bool Identifier::operator<(const Identifier& compKey) const {
309 return compareTo(compKey) < 0;
310}
311bool Identifier::operator>(const Identifier& compKey) const {
312 return compareTo(compKey) > 0;
313}
314bool Identifier::operator<=(const Identifier& compKey) const {
315 return compareTo(compKey) <= 0;
316}
317bool Identifier::operator>=(const Identifier& compKey) const {
318 return compareTo(compKey) >= 0;
319}
320bool Identifier::operator==(const Identifier& compKey) const {
321 return compareTo(compKey) == 0;
322}
323bool Identifier::operator!=(const Identifier& compKey) const {
324 return compareTo(compKey) != 0;
325}
326
327// bitwise xor
328Identifier Identifier::operator^(const Identifier& rhs) const {
329 Identifier result = *this;
330 for (uint i = 0; i < aSize; i++) {
331 result.key[i] ^= rhs.key[i];
332 }
333
334 return result;
335}
336
337// bitwise or
338Identifier Identifier::operator|(const Identifier& rhs) const {
339 Identifier result = *this;
340 for (uint i = 0; i < aSize; i++) {
341 result.key[i] |= rhs.key[i];
342 }
343
344 return result;
345}
346
347// bitwise and
348Identifier Identifier::operator&(const Identifier& rhs) const {
349 Identifier result = *this;
350 for (uint i = 0; i < aSize; i++) {
351 result.key[i] &= rhs.key[i];
352 }
353
354 return result;
355}
356
357// complement
358Identifier Identifier::operator~() const {
359 Identifier result = *this;
360 for (uint i = 0; i < aSize; i++) {
361 result.key[i] = ~key[i];
362 }
363 result.trim();
364
365 return result;
366}
367
368// bitwise shift right
369Identifier Identifier::operator>>(uint num) const {
370 Identifier result = ZERO;
371 int i = num / GMP_LIMB_BITS;
372
373 num %= GMP_LIMB_BITS;
374
375 if (i >= (int) aSize) return result;
376
377 for (int j = 0; j < (int) aSize - i; j++) {
378 result.key[j] = key[j + i];
379 }
380 mpn_rshift(result.key, result.key, aSize, num);
381 result.isUnspec = false;
382 result.trim();
383
384 return result;
385}
386
387// bitwise shift left
388Identifier Identifier::operator<<(uint num) const {
389 Identifier result = ZERO;
390 int i = num / GMP_LIMB_BITS;
391
392 num %= GMP_LIMB_BITS;
393
394 if (i >= (int) aSize) return result;
395
396 for (int j = 0; j < (int) aSize - i; j++) {
397 result.key[j + i] = key[j];
398 }
399 mpn_lshift(result.key, result.key, aSize, num);
400 result.isUnspec = false;
401 result.trim();
402
403 return result;
404}
405
406// get bit
407IdentifierBit Identifier::operator[](uint n) {
408 return IdentifierBit(get(n, 1), n, this);
409}
410
411Identifier& Identifier::setBitAt(uint pos, bool value) {
412 mp_limb_t digit = 1;
413 digit = digit << (pos % GMP_LIMB_BITS);
414
415 if (value) {
416 key[pos / GMP_LIMB_BITS] |= digit;
417 } else {
418 //key[pos / GMP_LIMB_BITS] = key[pos / GMP_LIMB_BITS] & ~digit;
419 key[pos / GMP_LIMB_BITS] &= ~digit;
420 }
421
422 return *this;
423}
424;
425
426//--------------------------------------------------------------------
427// additional math
428//--------------------------------------------------------------------
429
430// returns a sub integer
431uint32_t Identifier::get(uint p, uint n) const {
432 int i = p / GMP_LIMB_BITS, // index of starting bit
433 f = p % GMP_LIMB_BITS, // position of starting bit
434 f2 = f + n - GMP_LIMB_BITS; // how many bits to take from next index
435
436 if (p + n > Identifier::keyLength) {
437 logging_error( "Identifier::get: Invalid range (index too large!)" );
438 return 0;
439 }
440
441 return ((key[i] >> f) | // get the bits of key[i]
442 (f2 > 0 ? (key[i + 1] << (GMP_LIMB_BITS - f)) : 0)) & // the extra bits from key[i+1]
443 (((uint32_t) (~0)) >> (GMP_LIMB_BITS - n)); // delete unused bits
444}
445
446// fill suffix with random bits
447Identifier Identifier::randomSuffix(uint pos) const {
448 Identifier newKey = *this;
449 int i = pos / GMP_LIMB_BITS, j = pos % GMP_LIMB_BITS;
450 mp_limb_t m = ((mp_limb_t) 1 << j) - 1;
451 mp_limb_t rnd;
452
453 mpn_random(&rnd, 1);
454 newKey.key[i] &= ~m;
455 newKey.key[i] |= (rnd & m);
456 mpn_random(newKey.key, i);
457 newKey.trim();
458
459 return newKey;
460}
461
462// fill prefix with random bits
463Identifier Identifier::randomPrefix(uint pos) const {
464 Identifier newKey = *this;
465 int i = pos / GMP_LIMB_BITS, j = pos % GMP_LIMB_BITS;
466 mp_limb_t m = ((mp_limb_t) 1 << j) - 1;
467 mp_limb_t rnd;
468
469 mpn_random(&rnd, 1);
470
471 newKey.key[i] &= m;
472 newKey.key[i] |= (rnd & ~m);
473 for (int k = aSize - 1; k != i; k--) {
474 mpn_random(&newKey.key[k], 1);
475 }
476 newKey.trim();
477
478 return newKey;
479}
480
481// calculate shared prefix length
482uint Identifier::sharedPrefixLength(const Identifier& compKey) const {
483 if (compareTo(compKey) == 0) return keyLength;
484
485 uint length = 0;
486 int i;
487 uint j;
488 bool msb = true;
489
490 // count equal limbs first:
491 for (i = aSize - 1; i >= 0; --i) {
492 if (this->key[i] != compKey.key[i]) {
493 // XOR first differing limb for easy counting of the bits:
494 mp_limb_t d = this->key[i] ^ compKey.key[i];
495 if (msb) d <<= (GMP_LIMB_BITS - (keyLength % GMP_LIMB_BITS));
496 for (j = GMP_LIMB_BITS - 1; d >>= 1; --j)
497 ;
498 length += j;
499 break;
500 }
501 length += GMP_LIMB_BITS;
502 msb = false;
503 }
504
505 return length;
506}
507
508// calculate log of base 2
509int Identifier::log_2() const {
510 int16_t i = aSize - 1;
511
512 while (i >= 0 && key[i] == 0) {
513 i--;
514 }
515
516 if (i < 0) {
517 return -1;
518 }
519
520 mp_limb_t j = key[i];
521 i *= GMP_LIMB_BITS;
522 while (j != 0) {
523 j >>= 1;
524 i++;
525 }
526
527 return i - 1;
528}
529
530// returns a simple hash of the key
531size_t Identifier::hash() const {
532 return (size_t) key[0];
533}
534
535// returns true, if this key is element of the interval (keyA, keyB)
536bool Identifier::isBetween(const Identifier& keyA, const Identifier& keyB) const {
537 if (isUnspec || keyA.isUnspec || keyB.isUnspec) return false;
538
539 if (*this == keyA) return false;
540 else if (keyA < keyB) return ((*this > keyA) && (*this < keyB));
541 else return ((*this > keyA) || (*this < keyB));
542}
543
544// returns true, if this key is element of the interval (keyA, keyB]
545bool Identifier::isBetweenR(const Identifier& keyA, const Identifier& keyB) const {
546 if (isUnspec || keyA.isUnspec || keyB.isUnspec) return false;
547
548 if ((keyA == keyB) && (*this == keyA)) return true;
549 else if (keyA <= keyB) return ((*this > keyA) && (*this <= keyB));
550 else return ((*this > keyA) || (*this <= keyB));
551}
552
553// returns true, if this key is element of the interval [keyA, keyB)
554bool Identifier::isBetweenL(const Identifier& keyA, const Identifier& keyB) const {
555 if (isUnspec || keyA.isUnspec || keyB.isUnspec) return false;
556
557 if ((keyA == keyB) && (*this == keyA)) return true;
558 else if (keyA <= keyB) return ((*this >= keyA) && (*this < keyB));
559 else return ((*this >= keyA) || (*this < keyB));
560}
561
562// returns true, if this key is element of the interval [keyA, keyB]
563bool Identifier::isBetweenLR(const Identifier& keyA, const Identifier& keyB) const {
564 if (isUnspec || keyA.isUnspec || keyB.isUnspec) return false;
565
566 if ((keyA == keyB) && (*this == keyA)) return true;
567 else if (keyA <= keyB) return ((*this >= keyA) && (*this <= keyB));
568 else return ((*this >= keyA) || (*this <= keyB));
569}
570
571//----------------------------------------------------------------------
572// statics and globals
573//----------------------------------------------------------------------
574
575// default console output
576std::ostream& operator<<(std::ostream& os, const Identifier& c) {
577 os << c.toString(16);
578 return os;
579}
580;
581
582// returns a key filled with bit 1
583Identifier Identifier::max() {
584 Identifier newKey;
585
586 for (uint i = 0; i < aSize; i++) {
587 newKey.key[i] = ~0;
588 }
589 newKey.isUnspec = false;
590 newKey.trim();
591
592 return newKey;
593}
594
595// generate random number
596Identifier Identifier::random() {
597 Identifier newKey = ZERO;
598
599 //as mpn_random has no seeding function
600 // we mess aroung here a little to achive randomness
601 Identifier keyRandom = ZERO;
602 mpn_random(keyRandom.key, aSize);
603 Identifier keyTime( time(NULL) );
604 mpn_mul_1( newKey.key, keyRandom.key, aSize, *keyTime.key );
605
606 newKey.trim();
607 return newKey;
608}
609
610
611// README: due to some problems with serialization the keylength
612// was changed to 192 bit! As none of the hashing functions
613// can provide 160 bit output, and we currently don't use any
614// hashing for identifiers in the demo at all ... this is all commented out!!
615
616
617// generate sha1 hash
618Identifier Identifier::sha1(const string& input) {
619 Identifier newKey;
620 uint8_t temp[20];
621 const char* c_str = input.c_str();
622
623 CSHA1 sha;
624 sha.Reset();
625 sha.Update( (uint8_t*)c_str, (uint32_t)input.size() );
626 sha.Final();
627 sha.GetHash(temp);
628 mpn_set_str(newKey.key, (const uint8_t*)temp,
629 (int)aSize * sizeof(mp_limb_t), 256);
630 newKey.isUnspec = false;
631 newKey.trim();
632
633 return newKey;
634}
635
636Identifier Identifier::sha1(const uint8_t* value, size_t length ) {
637 Identifier newKey;
638 uint8_t temp[20];
639
640 CSHA1 sha;
641 sha.Reset();
642 sha.Update( const_cast<uint8_t*>(value), (uint32_t)length );
643 sha.Final();
644 sha.GetHash(temp);
645 mpn_set_str( newKey.key, (const uint8_t*)temp, (int)aSize * sizeof(mp_limb_t), 256);
646 newKey.isUnspec = false;
647 newKey.trim();
648 return newKey;
649}
650
651
652
653// generate a key=2**exponent
654Identifier Identifier::pow2(uint exponent) {
655 Identifier newKey = ZERO;
656
657 newKey.key[exponent / GMP_LIMB_BITS] = (mp_limb_t) 1 << (exponent
658 % GMP_LIMB_BITS);
659
660 return newKey;
661}
662
663//--------------------------------------------------------------------
664// private methods (mostly inlines)
665//--------------------------------------------------------------------
666
667// trims a key after each operation
668inline void Identifier::trim() {
669 key[array_size] = ~0;
670 key[array_size - 1] &= GMP_MSB_MASK;
671}
672
673// compares this key to any other
674int Identifier::compareTo(const Identifier& compKey) const {
675
676 if( compKey.isUnspec == false && isUnspec == false )
677 return mpn_cmp( key, compKey.key, aSize );
678 else if( compKey.isUnspec == true && isUnspec == true )
679 return 0;
680 else
681 return -1;
682}
683
684}} // namespace ariba, common
Note: See TracBrowser for help on using the repository browser.